WELCOME TO GUARANTEED ENGINE & TRANSMISSION
QUALITY ENGINES. DEPENDABLE TRANSMISSIONS. POWER YOU CAN TRUST.
Find quality replacement engines, performance engines, crate engines, transmissions, and complete powertrain packages for your next automotive project.
Whether you’re replacing a failed engine, restoring a classic, upgrading your vehicle, or building a high-performance machine, Guaranteed Engine & Transmission is here to help you find the right powertrain for your needs. Explore our selection of replacement engines, complete engines, crate engines, LS engines, LT engines, V8 engines, and high-performance powerplants. Get the right transmission to transfer your engine’s power to the road. Browse available automatic and manual transmissions for a variety of applications.
OUR VALUES
Free Shipping on all orders
Shop with Confidence: Enjoy Free Shipping Hassle-Free Returns.
Secure Payment
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No Customs or Duty Fees!
Customer Support Available 24/7 – We’re Here to Help Anytime.
SHOP ENGINES AND TRANSMISSIONS
WHY GUARANTEED ENGINE & TRANSMISSION?
Get your engine or transmission delivered to your location with available shipping options across the United States.
CUSTOMER SUPPORT
Need help finding the right product? Our team is available to help you understand product specifications and choose an option suitable for your project.
BUILT FOR AUTOMOTIVE ENTHUSIASTS
REPLACE
Replace a worn, damaged, or failed engine with a suitable replacement powertrain.
RESTORE
Bring your classic or project vehicle back to life with a quality engine and transmission combination.
UPGRADE
Increase your vehicle’s performance with a more powerful engine or performance-oriented powertrain.
BUILD
Create your dream vehicle with an engine and transmission combination selected for your specific project.
SATISFIED CLIENTS
I recently purchased an LS3 engine from Guaranteed Engine & Transmission, and I’m very happy with the experience. The engine arrived safely, communication was great, and everything went smoothly.
I ordered a transmission for my truck and was impressed with the service. The transmission was well packaged, arrived on time, and was exactly what I was looking for. Great experience overall.
I needed a replacement engine for my vehicle and found exactly what I needed here. The ordering process was simple, shipping was handled professionally, and the engine arrived in good condition.
Great experience purchasing my engine from Guaranteed Engine & Transmission. The price was competitive, the communication was clear, and my order arrived safely. I would definitely consider buying from them again.
My transmission arrived safely and was packaged very well for shipping. The ordering process was easy, and the customer service was professional and responsive. I’m pleased with the overall experience.
I was looking for a quality engine at a reasonable price and found a great option here. The team answered my questions and made the purchase straightforward. Everything arrived as expected.
I purchased a transmission for my vehicle and had a very positive experience. Shipping was quicker than I expected, and the product was packaged securely. I would recommend checking them out if you need an engine or transmission.
Very satisfied with my engine purchase. From placing the order to receiving the shipment, the process was smooth and professional. The engine arrived safely, and I’m happy with the service I received.
I had a great experience purchasing an engine from Guaranteed Engine & Transmission. The team was professional, the ordering process was easy, and my engine arrived securely packaged and in good condition. I’m very pleased with the service and would buy from them again.

LS 5.3 500HP Engine for Sale | Rebuilt













